The 1-hour ozone standard, as well as designations and classifications
for all 1-hour ozone nonattainment and maintenance areas,
have been revoked except for the Greensboro, NC, Nashville, TN,
and Denver, CO maintenance areas.

The former 1-hour ozone designations and classifications as of June 15,
2004, are being retained in subpart C of Part 81 for purposes of the anti
backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references
subpart C of part 81 for the areas affected by the anti-backsliding
regulation. These classifications are either the nonattainment or
maintenance classifications as of June 14, 2004.